← All changes | includes/class-sqlite-object-cache.php +510 -442 1.3.5 → 1.6.0 View file →

		@@ -5,9 +5,9 @@
5	5	* @package WordPress Plugin Template/Includes
6	6	*/
7	7
8	8	if ( ! defined( 'ABSPATH' ) ) {
9		- exit;
	9	+ exit;
10	10	}
11	11
12	12	/**
13	13	* Main plugin class.
		@@ -14,525 +14,593 @@
14	14	*
15	15	* Only make one instance of this, please.
16	16	*/
17	17	class SQLite_Object_Cache {
18		- const CLEAN_EVENT_HOOK = 'sqlite_object_cache_clean';
	18	+ const CLEAN_EVENT_HOOK = 'sqlite_object_cache_clean';
19	19
20		- /**
21		- * Local instance of SQLite_Object_Cache_Admin_API
22		- *
23		- * @var SQLite_Object_Cache_Admin_API|null
24		- */
25		- public $admin;
	20	+ /**
	21	+ * Local instance of SQLite_Object_Cache_Admin_API
	22	+ *
	23	+ * @var SQLite_Object_Cache_Admin_API|null
	24	+ */
	25	+ public $admin;
26	26
27		- /**
28		- * Settings class object
29		- *
30		- * @var object
31		- * @access public
32		- * @since 1.0.0
33		- */
34		- public $settings;
	27	+ /**
	28	+ * Settings class object
	29	+ *
	30	+ * @var object
	31	+ * @access public
	32	+ * @since 1.0.0
	33	+ */
	34	+ public $settings;
35	35
36		- /**
37		- * The version number.
38		- *
39		- * @var string
40		- * @access public
41		- * @since 1.0.0
42		- */
43		- public $_version;
	36	+ /**
	37	+ * The version number.
	38	+ *
	39	+ * @var string
	40	+ * @access public
	41	+ * @since 1.0.0
	42	+ */
	43	+ public $_version;
44	44
45		- /**
46		- * The token.
47		- *
48		- * @var string
49		- * @access public
50		- * @since 1.0.0
51		- */
52		- public $_token;
	45	+ /**
	46	+ * The token.
	47	+ *
	48	+ * @var string
	49	+ * @access public
	50	+ * @since 1.0.0
	51	+ */
	52	+ public $_token;
53	53
54		- /**
55		- * The main plugin file.
56		- *
57		- * @var string
58		- * @access public
59		- * @since 1.0.0
60		- */
61		- public $file;
	54	+ /**
	55	+ * The main plugin file.
	56	+ *
	57	+ * @var string
	58	+ * @access public
	59	+ * @since 1.0.0
	60	+ */
	61	+ public $file;
62	62
63		- /**
64		- * The main plugin directory.
65		- *
66		- * @var string
67		- * @access public
68		- * @since 1.0.0
69		- */
70		- public $dir;
	63	+ /**
	64	+ * The main plugin directory.
	65	+ *
	66	+ * @var string
	67	+ * @access public
	68	+ * @since 1.0.0
	69	+ */
	70	+ public $dir;
71	71
72		- /**
73		- * The plugin assets directory.
74		- *
75		- * @var string
76		- * @access public
77		- * @since 1.0.0
78		- */
79		- public $assets_dir;
	72	+ /**
	73	+ * The plugin assets directory.
	74	+ *
	75	+ * @var string
	76	+ * @access public
	77	+ * @since 1.0.0
	78	+ */
	79	+ public $assets_dir;
80	80
81		- /**
82		- * The plugin assets URL.
83		- *
84		- * @var string
85		- * @access public
86		- * @since 1.0.0
87		- */
88		- public $assets_url;
	81	+ /**
	82	+ * The plugin assets URL.
	83	+ *
	84	+ * @var string
	85	+ * @access public
	86	+ * @since 1.0.0
	87	+ */
	88	+ public $assets_url;
89	89
90		- /**
91		- * Suffix for JavaScripts.
92		- *
93		- * @var string
94		- * @access public
95		- * @since 1.0.0
96		- */
97		- public $script_suffix;
	90	+ /**
	91	+ * Suffix for JavaScripts.
	92	+ *
	93	+ * @var string
	94	+ * @access public
	95	+ * @since 1.0.0
	96	+ */
	97	+ public $script_suffix;
98	98
99		- /**
100		- * Path for the drop-in when it is working.
101		- * @var string
102		- */
103		- public $dropinfiledest;
	99	+ /**
	100	+ * Path for the drop-in when it is working.
	101	+ * @var string
	102	+ */
	103	+ public $dropinfiledest;
104	104
105		- /**
106		- * Path for the drop-in in the plugin tree.
107		- * @var string
108		- */
109		- public $dropinfilesource;
	105	+ /**
	106	+ * Path for the drop-in in the plugin tree.
	107	+ * @var string
	108	+ */
	109	+ public $dropinfilesource;
110	110
111		- /**
112		- * Minimum required sqlite version.
113		- *
114		- * @var string
115		- */
116		- public $minimum_sqlite_version = '3.7.0';
	111	+ /**
	112	+ * Minimum required sqlite version.
	113	+ *
	114	+ * @var string
	115	+ */
	116	+ public $minimum_sqlite_version = '3.7.0';
117	117
118		- /**
119		- * Constructor funtion.
120		- *
121		- * @param string $file File constructor.
122		- * @param string $version Plugin version.
123		- */
124		- public function __construct( $file = '', $version = '1.3.5' ) {
125		- $this->_version = $version;
126		- $this->_token = 'sqlite_object_cache';
	118	+ /**
	119	+ * Constructor function.
	120	+ *
	121	+ * @param string $file File constructor.
	122	+ * @param string $version Plugin version.
	123	+ */
	124	+ public function __construct( $file = '', $version = '1.6.0' ) {
	125	+ $this->_version = $version;
	126	+ $this->_token = 'sqlite_object_cache';
127	127
128		- // Load plugin environment variables.
129		- $this->file = $file;
130		- $this->dir =
131		- trailingslashit( dirname( WP_CONTENT_DIR . '/plugins/' . plugin_basename( $this->file ) ) );
132		- $this->assets_dir = trailingslashit( $this->dir . 'assets' );
133		- $this->dropinfilesource = $this->assets_dir . 'drop-in/object-cache.php';
134		- $this->dropinfiledest = trailingslashit( WP_CONTENT_DIR ) . 'object-cache.php';
	128	+ // Load plugin environment variables.
	129	+ $this->file = $file;
	130	+ $this->dir =
	131	+ trailingslashit( dirname( trailingslashit( WP_PLUGIN_DIR ) . plugin_basename( $this->file ) ) );
	132	+ $this->assets_dir = trailingslashit( $this->dir . 'assets' );
	133	+ $this->dropinfilesource = $this->assets_dir . 'drop-in/object-cache.php';
	134	+ $this->dropinfiledest = trailingslashit( WP_CONTENT_DIR ) . 'object-cache.php';
135	135
136		- $this->assets_url = esc_url( trailingslashit( plugins_url( '/assets/', $this->file ) ) );
	136	+ $this->assets_url = esc_url( trailingslashit( plugins_url( '/assets/', $this->file ) ) );
137	137
138		- $this->script_suffix = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';
	138	+ $this->script_suffix = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';
139	139
140		- register_activation_hook( $this->file, array( $this, 'on_activation' ) );
141		- register_deactivation_hook( $this->file, array( $this, 'on_deactivation' ) );
	140	+ register_activation_hook( $this->file, array( $this, 'on_activation' ) );
	141	+ register_deactivation_hook( $this->file, array( $this, 'on_deactivation' ) );
142	142
143		- if ( is_admin() ) {
144		- // Load API for generic admin functions.
145		- $this->admin = new SQLite_Object_Cache_Admin_API();
146		- // Suppress backups
147		- new SQLite_Backup_Exclusion();
148		- }
	143	+ if ( is_admin() ) {
	144	+ // Load API for generic admin functions.
	145	+ $this->admin = new SQLite_Object_Cache_Admin_API();
	146	+ // Suppress backups
	147	+ new SQLite_Backup_Exclusion();
149	148
150		- // Handle localization.
151		- $this->load_plugin_textdomain();
152		- add_action( 'admin-init', array( $this, 'load_localization' ), 0 );
153		- add_action( 'admin_init', array( $this, 'maybe_update_dropin' ) );
	149	+ add_action( 'admin_notices', function () {
	150	+ $purged = get_site_transient( 'sqlite-object-cache-flush-on-update' );
	151	+ if ( $purged ) {
	152	+ delete_site_transient( 'sqlite-object-cache-flush-on-update' );
	153	+ $message = esc_html( __( 'A software installation or upgrade operation flushed the SQLite Object Cache.', 'sqlite-object-cache' ) )
	154	+ ?>
	155	+ <div class="notice notice-info sqlite-object-cache is-dismissible">
	156	+ <p><?php echo $message ?></p>
	157	+ </div>
	158	+ <?php
	159	+ }
	160	+ } );
	161	+ }
154	162
155		- /* handle cron cache cleanup */
156		- add_action( self::CLEAN_EVENT_HOOK, array( $this, 'clean_job' ), 10, 0 );
157		- if ( ! wp_next_scheduled( self::CLEAN_EVENT_HOOK ) ) {
158		- wp_schedule_event( time() + HOUR_IN_SECONDS, 'hourly', self::CLEAN_EVENT_HOOK );
159		- }
160		- /* Handle probabilistic non-cron cleanup, one request in 2000. */
161		- if ( 1 === rand( 1, 2000 ) ) {
162		- add_action( 'shutdown', function () {
163		- $this->clean_job( 1.25 );
164		- }, 999, 0 );
165		- }
166		- }
	163	+ add_action( 'admin_init', array( $this, 'maybe_update_dropin' ) );
167	164
168		- /**
169		- * Load plugin textdomain
170		- *
171		- * @access public
172		- * @return void
173		- * @since 1.0.0
174		- */
175		- public function load_plugin_textdomain() {
176		- $domain = 'sqlite-object-cache';
	165	+ /* Ensure nothing is cached after software upgrades. */
	166	+ add_action( 'upgrader_process_complete', function () {
	167	+ add_action( 'shutdown', function () {
	168	+ wp_cache_flush();
	169	+ set_site_transient( 'sqlite-object-cache-flush-on-update', true, HOUR_IN_SECONDS );
	170	+ }, 999 );
	171	+ wp_cache_flush();
	172	+ }, 0 );
177	173
178		- $locale = apply_filters( 'plugin_locale', get_locale(), $domain );
179	174
180		- load_textdomain( $domain, WP_LANG_DIR . '/' . $domain . '/' . $domain . '-' . $locale . '.mo' );
181		- load_plugin_textdomain( $domain, false, dirname( plugin_basename( $this->file ) ) . '/languages/' );
182		- }
	175	+ /* handle cron cache cleanup */
	176	+ add_action( self::CLEAN_EVENT_HOOK, array( $this, 'clean_job' ), 10, 0 );
	177	+ if ( ! wp_next_scheduled( self::CLEAN_EVENT_HOOK ) ) {
	178	+ wp_schedule_event( time() + HOUR_IN_SECONDS, 'hourly', self::CLEAN_EVENT_HOOK );
	179	+ }
	180	+ /* Handle probabilistic non-cron cleanup, one request in 2000. */
	181	+ if ( 1 === rand( 1, 2000 ) ) {
	182	+ add_action( 'shutdown', function () {
	183	+ $this->clean_job( 1.25 );
	184	+ }, 999, 0 );
	185	+ }
	186	+ }
183	187
184		- /**
185		- * WP_Cron task to clean cache entries.
186		- *
187		- * @param float $grace_factor Default 1.0
188		- *
189		- * @return void
190		- */
191		- public function clean_job( $grace_factor = 1.0 ) {
192		- $option = get_option( $this->_token . '_settings', array() );
193		- $target_size = empty ( $option['target_size'] ) ? 4 : $option['target_size'];
194		- $target_size *= ( 1024 * 1024 );
195		- $threshold_size = (int) ( $target_size * $grace_factor );
	188	+ /**
	189	+ * WP_Cron task to clean cache entries.
	190	+ *
	191	+ * @param float $grace_factor Default 1.0
	192	+ *
	193	+ * @return void
	194	+ */
	195	+ public function clean_job( $grace_factor = 1.0 ) {
	196	+ $option = get_option( $this->_token . '_settings', array() );
	197	+ $target_size = empty ( $option['target_size'] ) ? 16 : $option['target_size'];
	198	+ $target_size *= ( 1024 * 1024 );
	199	+ $threshold_size = (int) ( $target_size * $grace_factor );
196	200
197		- global $wp_object_cache;
198		- if ( ! method_exists( $wp_object_cache, 'sqlite_get_size' ) ) {
199		- return;
200		- }
201		- $current_size = $wp_object_cache->sqlite_get_size();
202		- /* Skip this if the current size is small enough. */
203		- if ( $current_size <= $threshold_size ) {
204		- return;
205		- }
	201	+ global $wp_object_cache;
	202	+ if ( ! method_exists( $wp_object_cache, 'sqlite_get_size' ) ) {
	203	+ return;
	204	+ }
	205	+ /* Clean up old statistics. Do this even when the cache is not over size. */
	206	+ $retention = empty ( $option['retainmeasurements'] ) ? 24 : $option['retainmeasurements'];
	207	+ $wp_object_cache->sqlite_reset_statistics( $retention * HOUR_IN_SECONDS );
206	208
207		- /* Remove expired items (transients mostly). */
208		- if ( $wp_object_cache->sqlite_remove_expired( true ) ) {
209		- /* If anything was removed, get the size again. */
210		- $current_size = $wp_object_cache->sqlite_get_size();
211		- }
	209	+ $current_size = $wp_object_cache->sqlite_get_size();
	210	+ /* Skip this if the current size is small enough. */
	211	+ if ( $current_size <= $threshold_size ) {
	212	+ return;
	213	+ }
212	214
213		- /* Skip this if the size is small enough, after removing expired items. */
214		- if ( $current_size <= $threshold_size ) {
215		- return;
216		- }
	215	+ /* Remove expired items (transients mostly). */
	216	+ if ( $wp_object_cache->sqlite_remove_expired() ) {
	217	+ /* If anything was removed, get the size again. */
	218	+ $current_size = $wp_object_cache->sqlite_get_size();
	219	+ }
217	220
218		- /* Clean up old statistics. */
219		- $retention = empty ( $option['retention'] ) ? 24 : $option['retention'];
220		- $wp_object_cache->sqlite_reset_statistics( $retention * HOUR_IN_SECONDS );
	221	+ /* Skip this if the size is small enough, after removing expired items. */
	222	+ if ( $current_size <= $threshold_size ) {
	223	+ return;
	224	+ }
221	225
222		- /* Delete the least-recently-updated items to get to the target size. */
223		- $wp_object_cache->sqlite_delete_old( $target_size, $current_size );
224		- }
	226	+ /* Delete the least-recently-updated items to get to the target size. */
	227	+ $wp_object_cache->sqlite_delete_old( $target_size, $current_size );
	228	+ }
225	229
226		- /**
227		- * Plugin activation hook
228		- *
229		- * @return void
230		- */
231		- public
232		- function on_activation() {
233		- /* make sure the autoloaded option is set when activating; avoid an extra dbms or cache hit to fetch it */
234		- $option = get_option( $this->_token . '_settings', 'default' );
235		- if ( 'default' === $option ) {
236		- update_option( $this->_token . '_settings', array(), true );
237		- }
238		- if ( true === $this->has_sqlite() ) {
239		- add_action( 'shutdown', array( $this, 'update_dropin' ) );
240		- }
241		- }
	230	+ /**
	231	+ * Plugin activation hook
	232	+ *
	233	+ * @return void
	234	+ */
	235	+ public function on_activation() {
242	236
243		- /**
244		- * Determine whether we can use SQLite3.
245		- *
246		- * @return bool|string true, or an error message.
247		- */
248		- public
249		- function has_sqlite() {
250		- if ( ! class_exists( 'SQLite3' ) || ! extension_loaded( 'sqlite3' ) ) {
251		- return __( 'You cannot use the SQLite Object Cache plugin. Your server does not have php\'s SQLite3 extension installed.', 'sqlite-object-cache' );
252		- }
	237	+ $this->sync_apcu_global_to_option( true );
	238	+ if ( true === $this->has_sqlite() ) {
	239	+ add_action( 'shutdown', array( $this, 'update_dropin' ) );
	240	+ add_action( 'shutdown', array( $this, 'delete_all_transients_from_db' ) );
	241	+ }
	242	+ }
253	243
254		- $sqlite_version = $this->sqlite_get_version();
255		- if ( version_compare( $sqlite_version, $this->minimum_sqlite_version ) < 0 ) {
256		- return sprintf(
257		- /* translators: 1 actual SQLite version. 2 required SQLite version) */
258		- __( 'You cannot use the SQLite Object Cache plugin. Your server only offers SQLite3 version %1$s, but at least %2$s is required.', 'sqlite-object-cache' ),
259		- $sqlite_version, $this->minimum_sqlite_version );
260		- }
	244	+ /**
	245	+ * Determine whether we can use SQLite3.
	246	+ *
	247	+ * @return bool|string true, or an error message.
	248	+ */
	249	+ public function has_sqlite() {
	250	+ if ( ! class_exists( 'SQLite3' ) || ! extension_loaded( 'sqlite3' ) ) {
	251	+ return __( 'You cannot use the SQLite Object Cache plugin. Your server does not have php\'s SQLite3 extension installed.', 'sqlite-object-cache' );
	252	+ }
261	253
262		- return true;
263		- }
	254	+ $sqlite_version = $this->sqlite_get_version();
	255	+ if ( version_compare( $sqlite_version, $this->minimum_sqlite_version ) < 0 ) {
	256	+ return sprintf(
	257	+ /* translators: 1 actual SQLite version. 2 required SQLite version) */
	258	+ __( 'You cannot use the SQLite Object Cache plugin. Your server only offers SQLite3 version %1$s, but at least %2$s is required.', 'sqlite-object-cache' ),
	259	+ $sqlite_version, $this->minimum_sqlite_version );
	260	+ }
264	261
265		- /**
266		- * Get the version number for the SQLite extension.
267		- *
268		- * @return string|false SQLite's version number.
269		- */
270		- public
271		- function sqlite_get_version() {
	262	+ return true;
	263	+ }
272	264
273		- if ( class_exists( 'SQLite3' ) ) {
274		- $version = SQLite3::version();
	265	+ /**
	266	+ * Get the version number for the SQLite extension.
	267	+ *
	268	+ * @return string|false SQLite's version number.
	269	+ */
	270	+ public function sqlite_get_version() {
275	271
276		- return $version['versionString'];
277		- }
	272	+ if ( class_exists( 'SQLite3' ) ) {
	273	+ $version = SQLite3::version();
278	274
279		- return false;
280		- }
	275	+ return $version['versionString'];
	276	+ }
281	277
282		- /**
283		- * Load plugin localization
284		- *
285		- * @access public
286		- * @return void
287		- * @since 1.0.0
288		- */
289		- public
290		- function load_localization() {
291		- load_plugin_textdomain( 'sqlite-object-cache', false, dirname( plugin_basename( $this->file ) ) . '/languages/' );
292		- }
	278	+ return false;
	279	+ }
293	280
294		- /**
295		- * Test if we can write in the WP_CONTENT_DIR and modify the `object-cache.php` drop-in
296		- *
297		- * @return true|WP_Error
298		- * @author Till Krüss
299		- *
300		- */
301		- public
302		- function test_filesystem_writing() {
303		- global $wp_filesystem;
	281	+ /**
	282	+ * Test if we can write in the WP_CONTENT_DIR and modify the `object-cache.php` drop-in
	283	+ *
	284	+ * @return true|WP_Error
	285	+ * @author Till Krüss
	286	+ *
	287	+ */
	288	+ public function test_filesystem_writing() {
	289	+ global $wp_filesystem;
304	290
305		- if ( ! $this->initialize_filesystem( '', true ) ) {
306		- return new WP_Error( 'fs', __( 'Could not initialize filesystem.', 'sqlite-object-cache' ) );
307		- }
	291	+ if ( ! $this->initialize_filesystem( '', true ) ) {
	292	+ return new WP_Error( 'fs', __( 'Could not initialize filesystem.', 'sqlite-object-cache' ) );
	293	+ }
308	294
309		- $testfiledest = WP_CONTENT_DIR . '/sqlite-write-test.tmp';
	295	+ $testfiledest = WP_CONTENT_DIR . '/sqlite-write-test.tmp';
310	296
311		- if ( ! $wp_filesystem->exists( $this->dropinfilesource ) ) {
312		- return new WP_Error( 'exists', __( 'Object cache drop-in file doesn’t exist.', 'sqlite-object-cache' ) );
313		- }
	297	+ if ( ! $wp_filesystem->exists( $this->dropinfilesource ) ) {
	298	+ return new WP_Error( 'exists', __( 'Object cache drop-in file doesn’t exist.', 'sqlite-object-cache' ) );
	299	+ }
314	300
315		- if ( $wp_filesystem->exists( $testfiledest ) && ! $wp_filesystem->delete( $testfiledest ) ) {
316		- return new WP_Error( 'delete', __( 'Test file exists, but couldn’t be deleted.', 'sqlite-object-cache' ) );
317		- }
	301	+ if ( $wp_filesystem->exists( $testfiledest ) && ! $wp_filesystem->delete( $testfiledest ) ) {
	302	+ return new WP_Error( 'delete', __( 'Test file exists, but couldn’t be deleted.', 'sqlite-object-cache' ) );
	303	+ }
318	304
319		- if ( ! $wp_filesystem->is_writable( WP_CONTENT_DIR ) ) {
320		- return new WP_Error( 'copy', __( 'Content directory is not writable.', 'sqlite-object-cache' ) );
321		- }
	305	+ if ( ! $wp_filesystem->is_writable( WP_CONTENT_DIR ) ) {
	306	+ return new WP_Error( 'copy', __( 'Content directory is not writable.', 'sqlite-object-cache' ) );
	307	+ }
322	308
323		- if ( ! $wp_filesystem->copy( $this->dropinfilesource, $testfiledest, true, FS_CHMOD_FILE ) ) {
324		- return new WP_Error( 'copy', __( 'Failed to copy test file.', 'sqlite-object-cache' ) );
325		- }
	309	+ if ( ! $wp_filesystem->copy( $this->dropinfilesource, $testfiledest, true, FS_CHMOD_FILE ) ) {
	310	+ return new WP_Error( 'copy', __( 'Failed to copy test file.', 'sqlite-object-cache' ) );
	311	+ }
326	312
327		- if ( ! $wp_filesystem->exists( $testfiledest ) ) {
328		- return new WP_Error( 'exists', __( 'Copied test file doesn’t exist.', 'sqlite-object-cache' ) );
329		- }
	313	+ if ( ! $wp_filesystem->exists( $testfiledest ) ) {
	314	+ return new WP_Error( 'exists', __( 'Copied test file doesn’t exist.', 'sqlite-object-cache' ) );
	315	+ }
330	316
331		- $meta = get_file_data( $testfiledest, array( 'Version' => 'Version' ) );
	317	+ $meta = get_file_data( $testfiledest, array( 'Version' => 'Version' ) );
332	318
333		- if ( $meta['Version'] !== $this->_version ) {
334		- return new WP_Error( 'version', __( 'Couldn’t verify test file contents.', 'sqlite-object-cache' ) );
335		- }
	319	+ if ( $meta['Version'] !== $this->_version ) {
	320	+ return new WP_Error( 'version', __( 'Couldn’t verify test file contents.', 'sqlite-object-cache' ) );
	321	+ }
336	322
337		- if ( ! $wp_filesystem->delete( $testfiledest ) ) {
338		- return new WP_Error( 'delete', __( 'Copied test file couldn’t be deleted.', 'sqlite-object-cache' ) );
339		- }
	323	+ if ( ! $wp_filesystem->delete( $testfiledest ) ) {
	324	+ return new WP_Error( 'delete', __( 'Copied test file couldn’t be deleted.', 'sqlite-object-cache' ) );
	325	+ }
340	326
341		- return true;
342		- }
	327	+ return true;
	328	+ }
343	329
344		- /**
345		- * Initializes the WP filesystem API to be ready for use
346		- *
347		- * @param string $url The URL to post the form to.
348		- * @param bool $silent Whether to ask the user for credentials if necessary or not.
349		- *
350		- * @return bool
351		- * @author Till Krüss
352		- *
353		- */
354		- public
355		- function initialize_filesystem(
356		- $url, $silent = false
357		- ) {
358		- require_once ABSPATH . 'wp-admin/includes/file.php';
359		- if ( $silent ) {
360		- ob_start();
361		- }
	330	+ /**
	331	+ * Initializes the WP filesystem API to be ready for use
	332	+ *
	333	+ * @param string $url The URL to post the form to.
	334	+ * @param bool $silent Whether to ask the user for credentials if necessary or not.
	335	+ *
	336	+ * @return bool
	337	+ * @author Till Krüss
	338	+ *
	339	+ */
	340	+ public function initialize_filesystem( $url, $silent = false ) {
	341	+ require_once ABSPATH . 'wp-admin/includes/file.php';
	342	+ if ( $silent ) {
	343	+ ob_start();
	344	+ }
362	345
363		- $credentials = request_filesystem_credentials( $url );
	346	+ $credentials = request_filesystem_credentials( $url );
364	347
365		- if ( false === $credentials ) {
366		- if ( $silent ) {
367		- ob_end_clean();
368		- }
	348	+ if ( false === $credentials ) {
	349	+ if ( $silent ) {
	350	+ ob_end_clean();
	351	+ }
369	352
370		- return false;
371		- }
	353	+ return false;
	354	+ }
372	355
373		- if ( ! WP_Filesystem( $credentials ) ) {
374		- request_filesystem_credentials( $url );
	356	+ if ( ! WP_Filesystem( $credentials ) ) {
	357	+ request_filesystem_credentials( $url );
375	358
376		- if ( $silent ) {
377		- ob_end_clean();
378		- }
	359	+ if ( $silent ) {
	360	+ ob_end_clean();
	361	+ }
379	362
380		- return false;
381		- }
	363	+ return false;
	364	+ }
382	365
383		- return true;
384		- }
	366	+ return true;
	367	+ }
385	368
386		- /**
387		- * Calls the drop-in update method if necessary
388		- *
389		- * @return void
390		- * @author Till Krüss
391		- */
392		- public
393		- function maybe_update_dropin() {
394		- if ( defined( 'WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE' ) && WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE ) {
395		- return;
396		- }
	369	+ /**
	370	+ * Calls the drop-in update method if necessary
	371	+ *
	372	+ * @return void
	373	+ * @author Till Krüss
	374	+ */
	375	+ public function maybe_update_dropin() {
	376	+ if ( defined( 'WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE' ) && WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE ) {
	377	+ return;
	378	+ }
397	379
398		- $has = $this->has_sqlite();
399		- if ( ( true === $has ) && $this->object_cache_dropin_needs_updating() ) {
400		- add_action( 'shutdown', array( $this, 'update_dropin' ) );
401		- }
402		- }
	380	+ $has = $this->has_sqlite();
	381	+ if ( ( true === $has ) && $this->object_cache_dropin_needs_updating() ) {
	382	+ add_action( 'shutdown', array( $this, 'update_dropin' ) );
	383	+ }
	384	+ }
403	385
404		- /**
405		- * Checks if the `object-cache.php` drop-in is outdated
406		- * @return bool
407		- * @author Till Krüss
408		- *
409		- */
410		- public
411		- function object_cache_dropin_needs_updating() {
412		- if ( ! $this->object_cache_dropin_exists() ) {
413		- return true;
414		- }
	386	+ /**
	387	+ * Checks if the `object-cache.php` drop-in is outdated
	388	+ * @return bool
	389	+ * @author Till Krüss
	390	+ *
	391	+ */
	392	+ public function object_cache_dropin_needs_updating() {
	393	+ global $wp_object_cache;
	394	+ if ( ! method_exists( $wp_object_cache, 'dropin_get_version' ) ) {
	395	+ return true;
	396	+ }
	397	+ return version_compare( $wp_object_cache->dropin_get_version(), $this->_version, '<' );
	398	+ }
415	399
416		- $dropin = get_plugin_data( $this->dropinfiledest );
417		- $plugin = get_plugin_data( $this->dropinfilesource );
	400	+ /**
	401	+ * Updates the `object-cache.php` drop-in
	402	+ *
	403	+ * @return void
	404	+ * @author Till Krüss
	405	+ */
	406	+ public function update_dropin() {
	407	+ global $wp_filesystem;
	408	+ $has = $this->has_sqlite();
	409	+ if ( true === $has && $this->initialize_filesystem( '', true ) ) {
418	410
419		- if ( $dropin['PluginURI'] === $plugin['PluginURI'] ) {
420		- return version_compare( $dropin['Version'], $plugin['Version'], '<' );
421		- }
	411	+ $this->delete_sqlite_files();
	412	+ $result = $wp_filesystem->copy( $this->dropinfilesource, $this->dropinfiledest, true, FS_CHMOD_FILE );
	413	+ /**
	414	+ * Fires on cache enable event
	415	+ *
	416	+ * @param bool $result Whether the filesystem event (copy of the `object-cache.php` file) was successful.
	417	+ *
	418	+ * @since 0.1.0
	419	+ */
	420	+ do_action( 'sqlite_object_cache_update_dropin', $result );
	421	+ }
	422	+ }
422	423
423		- return false;
424		- }
	424	+ /**
	425	+ * Validates the `object-cache.php` drop-in
	426	+ *
	427	+ * @return bool
	428	+ * @author Till Krüss
	429	+ */
	430	+ public function validate_object_cache_dropin() {
	431	+ global $wp_object_cache;
425	432
426		- /**
427		- * Checks if the `object-cache.php` drop-in exists
428		- *
429		- * @return bool
430		- * @author Till Krüss
431		- */
432		- public
433		- function object_cache_dropin_exists() {
434		- return @file_exists( $this->dropinfiledest );
435		- }
	433	+ if ( ! method_exists( $wp_object_cache, 'dropin_get_version' ) ) {
	434	+ return false;
	435	+ }
436	436
437		- /**
438		- * Updates the `object-cache.php` drop-in
439		- *
440		- * @return void
441		- * @author Till Krüss
442		- */
443		- public
444		- function update_dropin() {
445		- global $wp_filesystem;
446		- $has = $this->has_sqlite();
447		- if ( true === $has && $this->initialize_filesystem( '', true ) ) {
	437	+ $dropin = get_plugin_data( $this->dropinfiledest );
	438	+ $plugin = get_plugin_data( $this->dropinfilesource );
448	439
449		- $this->delete_sqlite_files();
450		- $result = $wp_filesystem->copy( $this->dropinfilesource, $this->dropinfiledest, true, FS_CHMOD_FILE );
451		- /**
452		- * Fires on cache enable event
453		- *
454		- * @param bool $result Whether the filesystem event (copy of the `object-cache.php` file) was successful.
455		- *
456		- * @since 0.1.0
457		- */
458		- do_action( 'sqlite_object_cache_update_dropin', $result );
459		- }
460		- }
	440	+ /**
	441	+ * Filters the drop-in validation state
	442	+ *
	443	+ * @param bool $state The validation state of the drop-in.
	444	+ * @param string $dropin The `PluginURI` of the drop-in.
	445	+ * @param string $plugin The `PluginURI` of the plugin.
	446	+ *
	447	+ * @since 2.0.16
	448	+ */
	449	+ return apply_filters(
	450	+ 'sqlite_object_cache_validate_dropin',
	451	+ $dropin['PluginURI'] === $plugin['PluginURI'],
	452	+ $dropin['PluginURI'],
	453	+ $plugin['PluginURI']
	454	+ );
	455	+ }
461	456
462		- /**
463		- * Validates the `object-cache.php` drop-in
464		- *
465		- * @return bool
466		- * @author Till Krüss
467		- */
468		- public function validate_object_cache_dropin() {
469		- if ( ! $this->object_cache_dropin_exists() ) {
470		- return false;
471		- }
	457	+ /**
	458	+ * Plugin deactivation hook
	459	+ *
	460	+ * @param string $plugin Plugin basename.
	461	+ *
	462	+ * @return void
	463	+ * @author Till Krüss
	464	+ */
	465	+ public function on_deactivation( $plugin ) {
472	466
473		- $dropin = get_plugin_data( $this->dropinfiledest );
474		- $plugin = get_plugin_data( $this->dropinfilesource );
	467	+ wp_cache_flush();
475	468
476		- /**
477		- * Filters the drop-in validation state
478		- *
479		- * @param bool $state The validation state of the drop-in.
480		- * @param string $dropin The `PluginURI` of the drop-in.
481		- * @param string $plugin The `PluginURI` of the plugin.
482		- *
483		- * @since 2.0.16
484		- */
485		- return apply_filters(
486		- 'sqlite_object_cache_validate_dropin',
487		- $dropin['PluginURI'] === $plugin['PluginURI'],
488		- $dropin['PluginURI'],
489		- $plugin['PluginURI']
490		- );
491		- }
	469	+ wp_unschedule_hook( self::CLEAN_EVENT_HOOK );
	470	+ $this->delete_sqlite_files();
	471	+ $this->delete_dropin();
	472	+ $this->delete_all_transients_from_db();
	473	+ }
492	474
493		- /**
494		- * Plugin deactivation hook
495		- *
496		- * @param string $plugin Plugin basename.
497		- *
498		- * @return void
499		- * @author Till Krüss
500		- */
501		- public
502		- function on_deactivation( $plugin ) {
503		- wp_cache_flush();
	475	+ private function delete_sqlite_files() {
	476	+ global $wp_filesystem;
	477	+ global $wp_object_cache;
504	478
505		- wp_unschedule_hook( self::CLEAN_EVENT_HOOK );
506		- $this->delete_sqlite_files();
507		- $this->delete_dropin();
508		- }
	479	+ if ( method_exists( $wp_object_cache, 'sqlite_files' ) ) {
	480	+ if ( $this->initialize_filesystem( '', true ) ) {
	481	+ foreach ( $wp_object_cache->sqlite_files() as $file ) {
	482	+ $wp_filesystem->delete( $file );
	483	+ }
	484	+ }
	485	+ }
	486	+ }
509	487
510		- private function delete_sqlite_files() {
511		- global $wp_filesystem;
512		- global $wp_object_cache;
	488	+ private function delete_dropin() {
	489	+ global $wp_filesystem;
	490	+ ob_start();
513	491
514		- ob_start();
	492	+ if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
	493	+ $wp_filesystem->delete( $this->dropinfiledest );
	494	+ }
515	495
516		- if ( method_exists( $wp_object_cache, 'sqlite_files' ) ) {
517		- if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
518		- foreach ( $wp_object_cache->sqlite_files() as $file ) {
519		- $wp_filesystem->delete( $file );
520		- }
521		- }
522		- }
	496	+ ob_end_clean();
	497	+ }
523	498
524		- ob_end_clean();
525		- }
	499	+ /**
	500	+ * Deletes all transients from the database.
	501	+ *
	502	+ * It is necessary to do this when deactivating a persistent object cache
	503	+ * because the transients are kept there, and the ones in the database are
	504	+ * possibly stale.
	505	+ *
	506	+ * This hammers performance. But deactivating a persistent object cache is
	507	+ * not a common operation.
	508	+ *
	509	+ * @global wpdb $wpdb WordPress database abstraction object.
	510	+ */
	511	+ public function delete_all_transients_from_db() {
	512	+ global $wpdb;
	513	+ if ( ! is_multisite() ) {
	514	+ $this->clear_blog_transients();
	515	+ // Single site stores site transients in the options table.
	516	+ $this->clear_blog_transients( '_site_transient_' );
	517	+ } else {
	518	+ foreach ( get_sites( array( 'number' => 0, 'fields' => 'ids', 'no_found_rows' => true, 'orderby' => false ) ) as $site_id ) {
	519	+ try {
	520	+ switch_to_blog( $site_id );
	521	+ $this->clear_blog_transients();
	522	+ } catch ( Exception $ex ) {
	523	+ /* Avoid crashes on transient clearing */
	524	+ error_log( 'SQLite Object Cache problem clearing transients. Blog ' . $site_id . ':' . $ex->getMessage() );
	525	+ } finally {
	526	+ restore_current_blog();
	527	+ }
	528	+ }
	529	+ // Multisite stores site transients in the sitemeta table.
	530	+ $wpdb->query(
	531	+ $wpdb->prepare(
	532	+ "DELETE FROM {$wpdb->sitemeta} WHERE a.meta_key LIKE %s",
	533	+ $wpdb->esc_like( '_site_transient_' ) . '%'
	534	+ )
	535	+ );
	536	+ }
	537	+ }
526	538
527		- private
528		- function delete_dropin() {
529		- global $wp_filesystem;
530		- ob_start();
	539	+ /**
	540	+ * DELETE transients from the current blog's options table.
	541	+ *
	542	+ * @param string $tag _site_transient_ or _transient_, the default.
	543	+ *
	544	+ * @return void
	545	+ */
	546	+ private function clear_blog_transients( $tag = '_transient_') {
	547	+ global $wpdb;
	548	+ $wpdb->query(
	549	+ $wpdb->prepare(
	550	+ "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s",
	551	+ $wpdb->esc_like( $tag ) . '%'
	552	+ )
	553	+ );
	554	+ }
531	555
532		- if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
533		- $wp_filesystem->delete( $this->dropinfiledest );
534		- }
	556	+ /**
	557	+ * @return bool True if APCu support is activated for this plugin.
	558	+ */
	559	+ public function apcu_is_activated() {
	560	+ return defined( 'WP_SQLITE_OBJECT_CACHE_APCU' ) && WP_SQLITE_OBJECT_CACHE_APCU
	561	+ && $this->apcu_extension_is_enabled();
	562	+ }
535	563
536		- ob_end_clean();
537		- }
	564	+ /**
	565	+ * @return bool True if the APCu extension is loaded and enabled.
	566	+ */
	567	+ public function apcu_extension_is_enabled() {
	568	+ return function_exists( 'apcu_enabled' ) && apcu_enabled();
	569	+ }
	570	+
	571	+ /**
	572	+ * Make sure WP_SQLITE_OBJECT_CACHE_APCU and $option['use_apcu'] match.
	573	+ *
	574	+ * @param bool $unconditional true if we should always change the option to match WP_SQLITE_OBJECT_CACHE_APCU.
	575	+ *
	576	+ * @return string 'on' or 'off': the current activation state of epcu.
	577	+ */
	578	+ public function sync_apcu_global_to_option( $unconditional = true ) {
	579	+ global $wp_object_cache;
	580	+ $option = get_option( $this->_token . '_settings', array() );
	581	+ $option_dirty = false;
	582	+ $updated_flag = array_key_exists( 'use_apcu_updated', $option );
	583	+ $use_apcu = array_key_exists( 'use_apcu', $option ) && 'on' === $option['use_apcu'] ? 'on' : 'off';
	584	+ if ( $updated_flag ) {
	585	+ unset ( $option['use_apcu_updated'] );
	586	+ $option_dirty = true;
	587	+ }
	588	+ $target_use_apcu = $this->apcu_is_activated() ? 'on' : 'off';
	589	+ if ( ! $unconditional && $updated_flag ) {
	590	+ $target_use_apcu = $use_apcu;
	591	+ }
	592	+ if ( $target_use_apcu !== $use_apcu ) {
	593	+ $option['use_apcu'] = $target_use_apcu;
	594	+ $option_dirty = true;
	595	+ }
	596	+ if ( $option_dirty ) {
	597	+ if ( method_exists( $wp_object_cache, 'apcu-clear_cache' ) ) {
	598	+ $wp_object_cache->apcu_clear_cache();
	599	+ }
	600	+ update_option( $this->_token . '_settings', $option, true );
	601	+ }
	602	+
	603	+ return $target_use_apcu;
	604	+ }
	605	+
538	606	}